Looking for that extra bit of range? When a 16" barrel doesn't deliver the velocity to get the ballistics you want turn to our 20" 5.56mm setup. Built with the toughest barrel steel on the market 4150CMV and nitrogen stress relieved for superior accuracy. Featuring a 15" quad rail to support all your accessories, mil-spec hard coat anodized upper and lower, and a rifle length gas system you can't go wrong with this distance setup. Allow 2 weeks for delivery

20" 5.56mm Upper Assembly:

Hardened Arms M4 Feed Ramp Flat Top Receiver

Black anodized mil-spec finished upper receiver

Feed ramps for increased feeding reliability on barrel and upper

Laser etched T-Marked upper receiver

4150CMV 5.56 High End Barrel Machined House

Black Melonite Finish

1/7 Barrel Twist

Chambered in 5.56 NATO (will also fire .223 ammo)

20" HBAR Profile barrel with M4 Extension

.750" diameter at gas block

1/2x28 threaded muzzle/barrel

Low profile gas block

Barrel dimpled to secure gas block

Rifle length gas system

A2 flash hider

Tactical Quad Rail free float 15" hand guard without end cap

Bi-Pod not included

Hardened Arms Forged Lower:

Mil-Spec 7075 Forged Lower

Mil-Spec Dimensions

Mil-Spec Lower Parts Kit Installed

M4 Collaspible Stock Installed

Works with all standard AR15 magazines

Magazine & Bipod not included

Hardened Arms rifles are high end, accurate, head spaced, inspected and test fired prior to shipping. They are built using stringent specs, top quality parts and procedures to ensure maximum reliability and performance.

You are responsible for knowing your state laws regarding barrel lengths, pistol, Short barreled rife restrictions, and rifles. 20% restocking fees if you can not take delivery due to state restriction. Dealer programs are available on our website. Two year warranty against manufacturer defects. Finishes will wear with use, no warranties apply to finish wear.

Rifles must ship to FFL in your state, and may take up to two weeks for delivery. Magazine shown is not included with purchase.